UReasonType class

Overview

This is an union object to improve safety and convenience of objects using Enum.

Enum provides a very powerful type for a specific group of data, but at the same time it means a loss of flexibility: values not defined in Enum are either completely ignored or an exception is thrown if parsing fails. This union object exists to solve that problem.

This union object handles the KnownValue, a known enum value defined in Lexicon, and the UnknownValue, an unknown string value not defined in Lexicon. In other words, it can handle unknown values while enjoying the type safety of Enum.

Usage

// use when syntax.
final value = object.when(
  knownValue: (data) => data, // => KnownReasonType
  unknownValue: (data) => data, // => String
);

// or simpler way.
if (object.isKnownValue) {
  print(object.knownValue); // => KnownReasonType or null
} else if (object.isUnknownValue) {
  print(object.unknownValue); // => String or null
}

Implementers

• UReasonTypeKnownValue
• UReasonTypeUnknownValue

Available extensions

• $UReasonTypeExtension

Annotations

• @freezed

Constructors

UReasonType.knownValue({required KnownReasonType data})

const

factory

UReasonType.unknownValue({required String data})

const

factory

Properties

data → Object

no setter, inherited

hashCode → int

The hash code for this object.

no setter, inherited

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

map<TResult extends Object?>({required TResult knownValue(UReasonTypeKnownValue value), required TResult unknownValue(UReasonTypeUnknownValue value)}) → TResult

inherited

mapOrNull<TResult extends Object?>({TResult? knownValue(UReasonTypeKnownValue value)?, TResult? unknownValue(UReasonTypeUnknownValue value)?}) → TResult?

inherited

maybeMap<TResult extends Object?>({TResult knownValue(UReasonTypeKnownValue value)?, TResult unknownValue(UReasonTypeUnknownValue value)?, required TResult orElse()}) → TResult

inherited

maybeWhen<TResult extends Object?>({TResult knownValue(KnownReasonType data)?, TResult unknownValue(String data)?, required TResult orElse()}) → TResult

inherited

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

toString() → String

A string representation of this object.

inherited

when<TResult extends Object?>({required TResult knownValue(KnownReasonType data), required TResult unknownValue(String data)}) → TResult

inherited

whenOrNull<TResult extends Object?>({TResult? knownValue(KnownReasonType data)?, TResult? unknownValue(String data)?}) → TResult?

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited